/Engine/Source/Runtime/MovieScene/Public/Containers/SparseBitSet.h
Set the bit at the specified index. Any bits between Num and BitIndex will be considered 0.
true if the bit was previously considered 0 and is now set, false if it was already set.
[ESparseBitSetBitResult](API\Runtime\MovieScene\Containers\UE__MovieScene__ESparseBitSetBit-) SetBit ( uint32 BitIndex )